Qt QGraphicsView framwork 圖形視圖框架

<span style="font-size:24px;">下邊這個博客講的很細</span>

<span style="font-size:24px;">http://blog.163.com/chen_lovtime/blog/static/10009874920107258514135/</span>

<span style="font-size:24px;">http://yleesun.blog.163.com/blog/static/2941340220096110165817/
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<span style="font-family: Arial, Helvetica, sans-serif; background-color: rgb(255, 255, 255);"><span style="font-size:24px;">QGraphicsView ------>QGraphicsScene------>QGraphicsItem</span></span>

我們將三個依次 命名如下：

視圖------>場景-------->項

</pre><p></p><p><span style="font-size:32px;">場景是一個容器，用來管理項。視圖是用來顯示場景</span></p><pre name="code" class="cpp"><span style="font-size:24px;">QGraphicsScene scene;
QGraphicsRectItem *rect = scene.addRect(QRectF(0, 0, 100, 100));</span>

<pre name="code" class="cpp"><span style="font-size:24px;">QGraphicsView view(&scene);</span>

<pre name="code" class="cpp"><span style="font-size:24px;">view.show();</span>

</pre><p><span style="font-size:24px;">定義一個場景，</span><pre name="code" class="cpp"><span style="font-size:24px;">在定義 RectItem，加入場景這個容器，將場景放入視圖。視圖管理顯示</span>

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